putc(S)

putc, putchar, fputc, putw -- put character or word on a stream

Syntax

cc ... -lc

#include <stdio.h>

int putc (c, stream)
int c;
FILE *stream;

int putchar (c)
int c;

int fputc (c, stream)
int c;
FILE *stream;

int putw (w, stream)
int w;
FILE *stream;

Description

putc- writes character to output stream

putchar- writes character to output stream

fputc- behaves as putc but is a function

putw- writes integer to output stream

The putc macro writes the character c onto the output stream (at the position where the file pointer, if defined, is pointing). putchar(c) is defined as putc(c, stdout). putc and putchar are macros.

fputc behaves like putc, but is a function rather than a macro. fputc runs more slowly than putc, but it takes less space per invocation and its name can be passed as an argument to a function.

putw writes the word (that is, integer) w to the output stream (at the position at which the file pointer, if defined, is pointing). The size of a word is the size of an integer and varies from machine to machine. putw neither assumes nor causes special alignment in the file.

Diagnostics

On success, these functions (with the exception of putw) each return the value they have written. (putw returns ferror (stream).) On failure, they return the constant EOF. This occurs if the file stream is not open for writing or if the output file cannot grow. Because EOF is a valid integer, ferror(S) should be used to detect putw errors.

Notes

Because it is implemented as a macro, putc evaluates a stream argument more than once. In particular, putc(c,f++) doesn't work sensibly. fputc should be used instead.

Because of possible differences in word length and byte ordering, files written using putw are machine-dependent, and may not be read using getw on a different processor.

Standards conformance

fputc, putc and putchar are conformant with:

X/Open Portability Guide, Issue 3, 1989 ;
ANSI X3.159-1989 Programming Language -- C ;
Intel386 Binary Compatibility Specification, Edition 2 (iBCSe2) ;
IEEE POSIX Std 1003.1-1990 System Application Program Interface (API) [C Language] (ISO/IEC 9945-1) ; and NIST FIPS 151-1 .

putw is conformant with: